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Seibel: You ve famously been involved in five or seven or however many generations of Smalltalk implementations Let s start with the first Smalltalk.

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Dan Ingalls that you did in BASIC You had a couple pages of notes from Alan Kay that you had to make real What did you do Ingalls: I just started typing in code I think the first thing was to validate the execution model There were just a couple of basic structures that were needed, the equivalent of a stack frame So I just made, it must have been an array, in BASIC, to do that and put together enough that would execute a piece of code Typically with something like that the word that s coming to mind is you breadboard it you just do what you need to do to put a structure in place that s the structure you think you re going to want to interpret and then try to make it work I remember the first thing we got to run was six factorial.

To explore versioning issues, suppose a client of this game library has a Scroll class (see Listing 8-2) representing magic spells written out on a scroll This class supports a Read method that invokes a spell: Listing 8-2 A Class for Magic Spells // client_gamecpp #using "game_librarydll" ref class Scroll : Item { public: void Read() { /* read the scroll and invoke the spell */ } }; Let s say that we are shipping a new version of our library, and we add functionality to read and write GameObject instances from a file So we add Read and Write methods, as in Listing 8-3 Listing 8-3.

It s a really simple example but it involves the process of dynamic lookup and creating new stack frames And then once you ve got that working, you come to understand how things are going to go and you find out what s difficult Eventually you figure out where the time s going and so you improve all those things Then, in this particular case, once that worked there was the problem of putting a layer on it which is essentially a parser so you can type text into it and get it to go into that structure that you breadboarded Then you ve got a little environment and you start learning things Then you say, OK, I see how this works, I m going to write it in assembly code, or whatever else Then you suddenly realize, Oh, yeah, we need automatic storage management.

So how are we going to do that It s one thing after another Seibel: So have there ever been things where that sort of just-in-time development either failed to work, or you knew it would not work and you had to do a design in some different way Ingalls: Well, you always do what you can and when you re stuck you always turn away and reflect In the spectrum of implementers, I probably err on the side of just making things happen A lot of that is because I get so much of a thrill bringing.

Summary

New Functionality for Game Objects public ref class GameObject { public: void Initialize(); virtual void Read() { /* read data from file */ } virtual void Write() { /* write data to file */ } }; They re virtual so that derived classes can read and write their own information, if needed The question is, What happens when the user upgrades to the new version In C++, what might happen is that the virtual Read method for reading the scroll would silently override the Read method to read from a file Then, at runtime, when we try to read data (as in Listing 8-4), the Read function in the Scroll class gets called and the game character casts a spell not what was intended at all! Listing 8-4 Reading with an Unintended Method void GameObject::Initialize() { if (reading_from_file) { Read(); // Oops! Scroll method called } // ...

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